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   <div id="projectname">VectSharp<span id="projectnumber">&#160;2.6.1</span>
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   <div id="projectbrief">A light library for C# vector graphics</div>
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<div class="header">
  <div class="headertitle"><div class="title">Materials.cs</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment">    VectSharp - A light library for C# vector graphics.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment">    Copyright (C) 2020-2022 Giorgio Bianchini</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"></span> </div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment">    This program is free software: you can redistribute it and/or modify</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment">    it under the terms of the GNU Lesser General Public License as published by</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment">    the Free Software Foundation, version 3.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"></span> </div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment">    This program is distributed in the hope that it will be useful,</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment">    GNU Lesser General Public License for more details.</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"></span> </div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment">    You should have received a copy of the GNU Lesser General Public License</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment">    along with this program. If not, see &lt;https://www.gnu.org/licenses/&gt;.</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment">*/</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="keyword">using </span>System;</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="keyword">using </span>System.Collections.Generic;</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="keyword">using </span>System.Diagnostics;</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="keyword">using </span>System.Linq;</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="keyword">using </span>System.Runtime.InteropServices.ComTypes;</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="keyword">using </span>System.Security.Cryptography.X509Certificates;</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="keyword">using </span>System.Text;</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span> </div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespace_vect_sharp_1_1_three_d.html">VectSharp.ThreeD</a></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span>{<span class="comment"></span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment">    /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment">    /// Represents a material used to the determine the appearance of &lt;see cref=&quot;Triangle3DElement&quot;/&gt;.</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment">    /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"><a class="line" href="interface_vect_sharp_1_1_three_d_1_1_i_material.html">   31</a></span><span class="comment"></span>    <span class="keyword">public</span> <span class="keyword">interface </span><a class="code hl_interface" href="interface_vect_sharp_1_1_three_d_1_1_i_material.html">IMaterial</a></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>    {<span class="comment"></span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment">        /// Obtains the &lt;see cref=&quot;Colour&quot;/&gt; at the specified point.</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment">        /// &lt;param name=&quot;point&quot;&gt;The point whose colour should be determined.&lt;/param&gt;</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment">        /// &lt;param name=&quot;surfaceNormal&quot;&gt;The normal to the surface at the specified &lt;paramref name=&quot;point&quot;/&gt;.&lt;/param&gt;</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment">        /// &lt;param name=&quot;camera&quot;&gt;The camera being used to render the scene.&lt;/param&gt;</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment">        /// &lt;param name=&quot;lights&quot;&gt;A list of light sources that are present in the scene.&lt;/param&gt;</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment">        /// &lt;param name=&quot;obstructions&quot;&gt;A list of values indicating how obstructed each light source is.&lt;/param&gt;</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment">        /// &lt;returns&gt;The &lt;see cref=&quot;Colour&quot;/&gt; of the specified point.&lt;/returns&gt;</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"><a class="line" href="interface_vect_sharp_1_1_three_d_1_1_i_material.html#a3c3617f4681090dac3e8fb7b3001f061">   42</a></span><span class="comment"></span>        <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> <a class="code hl_function" href="interface_vect_sharp_1_1_three_d_1_1_i_material.html#a3c3617f4681090dac3e8fb7b3001f061">GetColour</a>(Point3D point, NormalizedVector3D surfaceNormal, Camera camera, IList&lt;ILightSource&gt; lights, IList&lt;double&gt; obstructions);</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>    }</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"></span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment">    /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment">    /// Represents a material that always has the same colour, regardless of light.</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment">    /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_colour_material.html">   48</a></span><span class="comment"></span>    <span class="keyword">public</span> <span class="keyword">class </span><a class="code hl_class" href="class_vect_sharp_1_1_three_d_1_1_colour_material.html">ColourMaterial</a> : <a class="code hl_interface" href="interface_vect_sharp_1_1_three_d_1_1_i_material.html">IMaterial</a></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>    {<span class="comment"></span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment">        /// The colour of the material.</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#a7f1d2d721fbb1234f54bfb548e5e3e9f">   53</a></span><span class="comment"></span>        <span class="keyword">public</span> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> { <span class="keyword">get</span>; }</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"></span> </div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment">        /// Creates a new &lt;see cref=&quot;ColourMaterial&quot;/&gt; instance.</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment">        /// &lt;param name=&quot;colour&quot;&gt;The colour of the material.&lt;/param&gt;</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#aef763c07811d635c735c09255c1a87dd">   59</a></span><span class="comment"></span>        <span class="keyword">public</span> <a class="code hl_function" href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#aef763c07811d635c735c09255c1a87dd">ColourMaterial</a>(<a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> colour)</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>        {</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>            this.Colour = colour;</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>        }</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"></span> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment">        /// &lt;inheritdoc/&gt;</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#aa4768d1b81f524bfa20ac758fd999be1">   65</a></span><span class="comment"></span>        <span class="keyword">public</span> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> <a class="code hl_function" href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#aa4768d1b81f524bfa20ac758fd999be1">GetColour</a>(Point3D point, NormalizedVector3D surfaceNormal, Camera camera, IList&lt;ILightSource&gt; lights, IList&lt;double&gt; obstructions)</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>        {</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>            <span class="keywordflow">return</span> <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#a7f1d2d721fbb1234f54bfb548e5e3e9f">Colour</a>;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>        }</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>    }</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"></span> </div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment">    /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment">    /// Represents a material that uses a Phong reflection model to determine the colour of the material based on the light sources that hit it.</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment">    /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html">   74</a></span><span class="comment"></span>    <span class="keyword">public</span> <span class="keyword">class </span><a class="code hl_class" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html">PhongMaterial</a> : <a class="code hl_interface" href="interface_vect_sharp_1_1_three_d_1_1_i_material.html">IMaterial</a></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>    {<span class="comment"></span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment">        /// The base colour of the material.</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a32f51b8ad4fc376028537dc45e04c7dc">   79</a></span><span class="comment"></span>        <span class="keyword">public</span> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> { <span class="keyword">get</span>; }</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span> </div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>        <span class="keyword">private</span> (<span class="keywordtype">double</span> L, <span class="keywordtype">double</span> a, <span class="keywordtype">double</span> b) LabColour;</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>        <span class="keyword">private</span> (<span class="keywordtype">double</span> H, <span class="keywordtype">double</span> S, <span class="keywordtype">double</span> L) LabBlackHSL;</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>        <span class="keyword">private</span> (<span class="keywordtype">double</span> H, <span class="keywordtype">double</span> S, <span class="keywordtype">double</span> L) LabWhiteHSL;</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>        <span class="keyword">private</span> <span class="keywordtype">double</span> IntensityExponent;</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>        <span class="keyword">private</span> <span class="keywordtype">double</span> TotalLength;</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment"></span> </div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment">        /// A coefficient determining how much ambient light is reflected by the material.</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#add012f278676a4ff7e8c90fc9399c61a">   90</a></span><span class="comment"></span>        <span class="keyword">public</span> <span class="keywordtype">double</span> <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#add012f278676a4ff7e8c90fc9399c61a">AmbientReflectionCoefficient</a> { <span class="keyword">get</span>; <span class="keyword">set</span>; } = 1;</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment"></span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment">        /// A coefficient determining how much directional light is reflected by the material.</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a6ac50807dafd44e5400074c203456573">   95</a></span><span class="comment"></span>        <span class="keyword">public</span> <span class="keywordtype">double</span> <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a6ac50807dafd44e5400074c203456573">DiffuseReflectionCoefficient</a> { <span class="keyword">get</span>; <span class="keyword">set</span>; } = 1;</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment"></span> </div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment">        /// A coefficient determining the intensity of specular highlights.</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a08974b73ea9114a8cc03d2aadfbebae8">  100</a></span><span class="comment"></span>        <span class="keyword">public</span> <span class="keywordtype">double</span> <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a08974b73ea9114a8cc03d2aadfbebae8">SpecularReflectionCoefficient</a> { <span class="keyword">get</span>; <span class="keyword">set</span>; } = 1;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"></span> </div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">        /// A coefficient determining the extent of specular highlights.</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#adf1921529f41afafe1371376dc0aab96">  105</a></span><span class="comment"></span>        <span class="keyword">public</span> <span class="keywordtype">double</span> <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#adf1921529f41afafe1371376dc0aab96">SpecularShininess</a> { <span class="keyword">get</span>; <span class="keyword">set</span>; } = 1;</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment"></span> </div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">        /// Creates a new &lt;see cref=&quot;PhongMaterial&quot;/&gt; instance.</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">        /// &lt;param name=&quot;colour&quot;&gt;The base colour of the material.&lt;/param&gt;</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#af4fe3212a8500073ed4a1fa7b0e890f7">  111</a></span><span class="comment"></span>        <span class="keyword">public</span> <a class="code hl_function" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#af4fe3212a8500073ed4a1fa7b0e890f7">PhongMaterial</a>(<a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> colour)</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>        {</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>            this.Colour = colour;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>            this.LabColour = colour.ToLab();</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>            this.LabBlackHSL = <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a>.<a class="code hl_function" href="struct_vect_sharp_1_1_colour.html#a62b14ab9030bbf551742b2a57c2802c3">FromLab</a>(0, LabColour.a, LabColour.b).ToHSL();</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>            this.LabWhiteHSL = <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a>.<a class="code hl_function" href="struct_vect_sharp_1_1_colour.html#a62b14ab9030bbf551742b2a57c2802c3">FromLab</a>(1, LabColour.a, LabColour.b).ToHSL();</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>            this.TotalLength = 1 + LabBlackHSL.L + (1 - LabWhiteHSL.L);</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>            this.IntensityExponent = Math.Log((LabBlackHSL.L + LabColour.L) / TotalLength) / Math.Log(0.5);</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>        }</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span> </div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>        <span class="keyword">private</span> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> GetScaledColour(<span class="keywordtype">double</span> intensity)</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>        {</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>            intensity = Math.Max(Math.Min(intensity, 1), 0);</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span> </div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>            <span class="keywordtype">double</span> pos = Math.Pow(intensity, IntensityExponent) * TotalLength;</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span> </div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>            <span class="keywordflow">if</span> (pos &lt;= LabBlackHSL.L)</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>            {</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>                <span class="keywordflow">return</span> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a>.<a class="code hl_function" href="struct_vect_sharp_1_1_colour.html#a1ab093740db80d3af9d4c925170cdad5">FromHSL</a>(LabBlackHSL.H, LabBlackHSL.S, pos).<a class="code hl_function" href="struct_vect_sharp_1_1_colour.html#aa13c5ba1a5131ecaf5cae5c4504b728f">WithAlpha</a>(<a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a>.<a class="code hl_variable" href="struct_vect_sharp_1_1_colour.html#a782d99b814c42de20e4ab90422752788">A</a>);</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>            }</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (pos &gt;= 1 + LabBlackHSL.L)</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>            {</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>                <span class="keywordflow">return</span> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a>.<a class="code hl_function" href="struct_vect_sharp_1_1_colour.html#a1ab093740db80d3af9d4c925170cdad5">FromHSL</a>(LabWhiteHSL.H, LabWhiteHSL.S, LabWhiteHSL.L + pos - 1 - LabBlackHSL.L).<a class="code hl_function" href="struct_vect_sharp_1_1_colour.html#aa13c5ba1a5131ecaf5cae5c4504b728f">WithAlpha</a>(<a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a>.<a class="code hl_variable" href="struct_vect_sharp_1_1_colour.html#a782d99b814c42de20e4ab90422752788">A</a>);</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>            }</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>            {</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>                <span class="keywordflow">return</span> <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a32f51b8ad4fc376028537dc45e04c7dc">Colour</a>.<a class="code hl_function" href="struct_vect_sharp_1_1_colour.html#a62b14ab9030bbf551742b2a57c2802c3">FromLab</a>(pos - LabBlackHSL.L, LabColour.a, LabColour.b).<a class="code hl_function" href="struct_vect_sharp_1_1_colour.html#aa13c5ba1a5131ecaf5cae5c4504b728f">WithAlpha</a>(<a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a32f51b8ad4fc376028537dc45e04c7dc">Colour</a>.<a class="code hl_variable" href="struct_vect_sharp_1_1_colour.html#a782d99b814c42de20e4ab90422752788">A</a>);</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>            }</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>        }</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment"></span> </div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">        /// &lt;inheritdoc/&gt;</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#ab6ed521d888e49cb31c3ea2406f7034b">  142</a></span><span class="comment"></span>        <span class="keyword">public</span> <a class="code hl_struct" href="struct_vect_sharp_1_1_colour.html">Colour</a> <a class="code hl_function" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#ab6ed521d888e49cb31c3ea2406f7034b">GetColour</a>(Point3D point, NormalizedVector3D surfaceNormal, Camera camera, IList&lt;ILightSource&gt; lights, IList&lt;double&gt; obstructions)</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>        {</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>            <span class="keywordtype">double</span> intensity = 0;</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span> </div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span>            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; lights.Count; i++)</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>            {</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>                (<span class="keywordtype">double</span> lightIntensity, NormalizedVector3D lightDirection) = lights[i].GetLightAt(point);</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>                lightIntensity *= 1 - obstructions[i];</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span> </div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>                <span class="keywordflow">if</span> (<span class="keywordtype">double</span>.IsNaN(lightDirection.X))</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span>                {</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>                    intensity += lightIntensity * <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#add012f278676a4ff7e8c90fc9399c61a">AmbientReflectionCoefficient</a>;</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>                }</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>                <span class="keywordflow">else</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>                {</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>                    <span class="keywordtype">double</span> dotProd = lightDirection * surfaceNormal;</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span> </div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span>                    intensity += lightIntensity * Math.Max(0, dotProd) * <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a6ac50807dafd44e5400074c203456573">DiffuseReflectionCoefficient</a>;</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span> </div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span>                    <span class="keywordflow">if</span> (dotProd &gt; 0)</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>                    {</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>                        NormalizedVector3D mirroredDirection = (lightDirection - 2 * dotProd * surfaceNormal).Normalize();</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span> </div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>                        NormalizedVector3D cameraDirection = (camera.ViewPoint - point).Normalize();</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span> </div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>                        <span class="keywordtype">double</span> dotProd2 = mirroredDirection * cameraDirection;</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span> </div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>                        <span class="keywordflow">if</span> (dotProd2 &gt;= 0)</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>                        {</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span>                            intensity += lightIntensity * Math.Pow(dotProd2, <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#adf1921529f41afafe1371376dc0aab96">SpecularShininess</a>) * <a class="code hl_property" href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a08974b73ea9114a8cc03d2aadfbebae8">SpecularReflectionCoefficient</a>;</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span>                        }</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>                    }</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span>                }</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span>            }</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span> </div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>            <span class="keywordflow">return</span> GetScaledColour(intensity);</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span>        }</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span>    }</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>}</div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_colour_material_html"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_colour_material.html">VectSharp.ThreeD.ColourMaterial</a></div><div class="ttdoc">Represents a material that always has the same colour, regardless of light.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00048">Materials.cs:49</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_colour_material_html_a7f1d2d721fbb1234f54bfb548e5e3e9f"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#a7f1d2d721fbb1234f54bfb548e5e3e9f">VectSharp.ThreeD.ColourMaterial.Colour</a></div><div class="ttdeci">Colour Colour</div><div class="ttdoc">The colour of the material.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00053">Materials.cs:53</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_colour_material_html_aa4768d1b81f524bfa20ac758fd999be1"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#aa4768d1b81f524bfa20ac758fd999be1">VectSharp.ThreeD.ColourMaterial.GetColour</a></div><div class="ttdeci">Colour GetColour(Point3D point, NormalizedVector3D surfaceNormal, Camera camera, IList&lt; ILightSource &gt; lights, IList&lt; double &gt; obstructions)</div><div class="ttdoc">Obtains the Colour at the specified point. The Colour of the specified point.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00065">Materials.cs:65</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_colour_material_html_aef763c07811d635c735c09255c1a87dd"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_colour_material.html#aef763c07811d635c735c09255c1a87dd">VectSharp.ThreeD.ColourMaterial.ColourMaterial</a></div><div class="ttdeci">ColourMaterial(Colour colour)</div><div class="ttdoc">Creates a new ColourMaterial instance.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00059">Materials.cs:59</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_phong_material_html"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_phong_material.html">VectSharp.ThreeD.PhongMaterial</a></div><div class="ttdoc">Represents a material that uses a Phong reflection model to determine the colour of the material base...</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00074">Materials.cs:75</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_phong_material_html_a08974b73ea9114a8cc03d2aadfbebae8"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a08974b73ea9114a8cc03d2aadfbebae8">VectSharp.ThreeD.PhongMaterial.SpecularReflectionCoefficient</a></div><div class="ttdeci">double SpecularReflectionCoefficient</div><div class="ttdoc">A coefficient determining the intensity of specular highlights.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00100">Materials.cs:100</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_phong_material_html_a32f51b8ad4fc376028537dc45e04c7dc"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a32f51b8ad4fc376028537dc45e04c7dc">VectSharp.ThreeD.PhongMaterial.Colour</a></div><div class="ttdeci">Colour Colour</div><div class="ttdoc">The base colour of the material.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00079">Materials.cs:79</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_phong_material_html_a6ac50807dafd44e5400074c203456573"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#a6ac50807dafd44e5400074c203456573">VectSharp.ThreeD.PhongMaterial.DiffuseReflectionCoefficient</a></div><div class="ttdeci">double DiffuseReflectionCoefficient</div><div class="ttdoc">A coefficient determining how much directional light is reflected by the material.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00095">Materials.cs:95</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_phong_material_html_ab6ed521d888e49cb31c3ea2406f7034b"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#ab6ed521d888e49cb31c3ea2406f7034b">VectSharp.ThreeD.PhongMaterial.GetColour</a></div><div class="ttdeci">Colour GetColour(Point3D point, NormalizedVector3D surfaceNormal, Camera camera, IList&lt; ILightSource &gt; lights, IList&lt; double &gt; obstructions)</div><div class="ttdoc">Obtains the Colour at the specified point. The Colour of the specified point.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00142">Materials.cs:142</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_phong_material_html_add012f278676a4ff7e8c90fc9399c61a"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#add012f278676a4ff7e8c90fc9399c61a">VectSharp.ThreeD.PhongMaterial.AmbientReflectionCoefficient</a></div><div class="ttdeci">double AmbientReflectionCoefficient</div><div class="ttdoc">A coefficient determining how much ambient light is reflected by the material.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00090">Materials.cs:90</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_phong_material_html_adf1921529f41afafe1371376dc0aab96"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#adf1921529f41afafe1371376dc0aab96">VectSharp.ThreeD.PhongMaterial.SpecularShininess</a></div><div class="ttdeci">double SpecularShininess</div><div class="ttdoc">A coefficient determining the extent of specular highlights.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00105">Materials.cs:105</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_three_d_1_1_phong_material_html_af4fe3212a8500073ed4a1fa7b0e890f7"><div class="ttname"><a href="class_vect_sharp_1_1_three_d_1_1_phong_material.html#af4fe3212a8500073ed4a1fa7b0e890f7">VectSharp.ThreeD.PhongMaterial.PhongMaterial</a></div><div class="ttdeci">PhongMaterial(Colour colour)</div><div class="ttdoc">Creates a new PhongMaterial instance.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00111">Materials.cs:111</a></div></div>
<div class="ttc" id="ainterface_vect_sharp_1_1_three_d_1_1_i_material_html"><div class="ttname"><a href="interface_vect_sharp_1_1_three_d_1_1_i_material.html">VectSharp.ThreeD.IMaterial</a></div><div class="ttdoc">Represents a material used to the determine the appearance of Triangle3DElement.</div><div class="ttdef"><b>Definition:</b> <a href="_materials_8cs_source.html#l00031">Materials.cs:32</a></div></div>
<div class="ttc" id="ainterface_vect_sharp_1_1_three_d_1_1_i_material_html_a3c3617f4681090dac3e8fb7b3001f061"><div class="ttname"><a href="interface_vect_sharp_1_1_three_d_1_1_i_material.html#a3c3617f4681090dac3e8fb7b3001f061">VectSharp.ThreeD.IMaterial.GetColour</a></div><div class="ttdeci">Colour GetColour(Point3D point, NormalizedVector3D surfaceNormal, Camera camera, IList&lt; ILightSource &gt; lights, IList&lt; double &gt; obstructions)</div><div class="ttdoc">Obtains the Colour at the specified point.</div></div>
<div class="ttc" id="anamespace_vect_sharp_1_1_three_d_html"><div class="ttname"><a href="namespace_vect_sharp_1_1_three_d.html">VectSharp.ThreeD</a></div><div class="ttdef"><b>Definition:</b> <a href="_lights_8cs_source.html#l00022">Lights.cs:23</a></div></div>
<div class="ttc" id="astruct_vect_sharp_1_1_colour_html"><div class="ttname"><a href="struct_vect_sharp_1_1_colour.html">VectSharp.Colour</a></div><div class="ttdoc">Represents an RGB colour.</div><div class="ttdef"><b>Definition:</b> <a href="_colour_8cs_source.html#l00028">Colour.cs:29</a></div></div>
<div class="ttc" id="astruct_vect_sharp_1_1_colour_html_a1ab093740db80d3af9d4c925170cdad5"><div class="ttname"><a href="struct_vect_sharp_1_1_colour.html#a1ab093740db80d3af9d4c925170cdad5">VectSharp.Colour.FromHSL</a></div><div class="ttdeci">static Colour FromHSL(double h, double s, double l)</div><div class="ttdoc">Creates a Colour from HSL coordinates.</div><div class="ttdef"><b>Definition:</b> <a href="_colour_8cs_source.html#l00587">Colour.cs:587</a></div></div>
<div class="ttc" id="astruct_vect_sharp_1_1_colour_html_a62b14ab9030bbf551742b2a57c2802c3"><div class="ttname"><a href="struct_vect_sharp_1_1_colour.html#a62b14ab9030bbf551742b2a57c2802c3">VectSharp.Colour.FromLab</a></div><div class="ttdeci">static Colour FromLab(double L, double a, double b)</div><div class="ttdoc">Creates a Colour from CIE Lab coordinates (under Illuminant D65).</div><div class="ttdef"><b>Definition:</b> <a href="_colour_8cs_source.html#l00509">Colour.cs:509</a></div></div>
<div class="ttc" id="astruct_vect_sharp_1_1_colour_html_a782d99b814c42de20e4ab90422752788"><div class="ttname"><a href="struct_vect_sharp_1_1_colour.html#a782d99b814c42de20e4ab90422752788">VectSharp.Colour.A</a></div><div class="ttdeci">double A</div><div class="ttdoc">Alpha component of the colour. Range: [0, 1].</div><div class="ttdef"><b>Definition:</b> <a href="_colour_8cs_source.html#l00048">Colour.cs:48</a></div></div>
<div class="ttc" id="astruct_vect_sharp_1_1_colour_html_aa13c5ba1a5131ecaf5cae5c4504b728f"><div class="ttname"><a href="struct_vect_sharp_1_1_colour.html#aa13c5ba1a5131ecaf5cae5c4504b728f">VectSharp.Colour.WithAlpha</a></div><div class="ttdeci">static Colour WithAlpha(Colour original, double alpha)</div><div class="ttdoc">Create a new Colour with the same RGB components as the original  Colour, but with the specified alph...</div><div class="ttdef"><b>Definition:</b> <a href="_colour_8cs_source.html#l00340">Colour.cs:340</a></div></div>
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